Debian Bug report logs -
#932437
LUKS formatting of a 16 MB (sic!) device is possible, open not
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Bug#932437
; Package cryptsetup
.
(Fri, 19 Jul 2019 10:45:04 GMT) (full text, mbox, link).
Acknowledgement sent
to Marc Haber <mh+debian-packages@zugschlus.de>
:
New Bug report received and forwarded. Copy sent to Debian Cryptsetup Team <pkg-cryptsetup-devel@alioth-lists.debian.net>
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(Fri, 19 Jul 2019 10:45:04 GMT) (full text, mbox, link).
Message #5 received at submit@bugs.debian.org (full text, mbox, reply):
Package: cryptsetup
Version: 2:2.1.0-5
Severity: normal
Hi,
I would like to luksFormat a really tiny device (which will only hold a
single file) with LUKS or LUKS2. I have been doing this multiple times
in the past, and was surprised that it doesn't work any more with
current cryptsetup.
I already had to go from 4 MB to 16 MB for the format to succeed, but
the 16 MB device cannot be luksOpened ("Requested offset is beyond real
size of device /dev/sdf2."). This applies to both LUKS and LUKS2.
With a 32 MB device, I could luks2Format _and_ luks2Open _and_ even USE
device ;-) I didn't bother to try plain LUKS with that size then.
cryptsetup should be more clear about minimum space requirement, and it
should use them consistently. Having a minimum size is ok, if I know of
it, and being able to format but not open a device because it's too
small is a bug.
Greetings
Marc
Information forwarded
to debian-bugs-dist@lists.debian.org, Debian Cryptsetup Team <pkg-cryptsetup-devel@alioth-lists.debian.net>
:
Bug#932437
; Package cryptsetup
.
(Fri, 19 Jul 2019 11:21:08 GMT) (full text, mbox, link).
Acknowledgement sent
to Milan Broz <gmazyland@gmail.com>
:
Extra info received and forwarded to list. Copy sent to Debian Cryptsetup Team <pkg-cryptsetup-devel@alioth-lists.debian.net>
.
(Fri, 19 Jul 2019 11:21:08 GMT) (full text, mbox, link).
Message #10 received at 932437@bugs.debian.org (full text, mbox, reply):
On 19/07/2019 12:40, Marc Haber wrote:
> I would like to luksFormat a really tiny device (which will only hold a
> single file) with LUKS or LUKS2. I have been doing this multiple times
> in the past, and was surprised that it doesn't work any more with
> current cryptsetup.
Default header size is much bigger because it reserves space for more
keyslots and optionally online reencryption. But it can be changed.
You can now create even smaller device with LUKS2, if you are
ok with a very small metadata size and only one keyslot (size of keyslot depends on
a key size, example is for XTS 512bit key).
I am able to create just 1MB LUKS header this way:
cryptsetup luksFormat --type luks2 --luks2-metadata-size=16k --luks2-keyslots-size=256k img
or even smaller (here <300 kB), if you ignore default 1MB alignment
cryptsetup luksFormat --type luks2 --luks2-metadata-size=16k --luks2-keyslots-size=256k --align-payload=1 img
> cryptsetup should be more clear about minimum space requirement, and it
> should use them consistently. Having a minimum size is ok, if I know of
> it, and being able to format but not open a device because it's too
> small is a bug.
For detached header you must be able to format header only (no data area).
But for the normal device, it is a bug, it should not format device and then complain
that it is too small :)
Also I think we should print default header size in --help output...
Anyway, this is upstream bug, so if you want to fill an issue for us, tracker
is here https://gitlab.com/cryptsetup/cryptsetup/issues
Thanks,
Milan
Added tag(s) upstream.
Request was from Guilhem Moulin <guilhem@debian.org>
to control@bugs.debian.org
.
(Fri, 05 Aug 2022 13:03:03 GMT) (full text, mbox, link).
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Last modified:
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